Southern Terminus:  Junction King's Highway 7 just east of Elginfield (and Highway 4)

Northern Terminus:  As of Autumn 2004:  Junction King's Highways 9 and 89 in Harriston. 
                                        1998 - 2004:  Junction Kings Highway 89 just west of Palmerston.
                                        Prior to 1998:  Junction King's Highway 9 in Teviotdale.

Length:  Pre 1998: 96.9 km.  1998 - 2004: 88.0 km.  Current (As of Autumn 2004): 97.7 km.

Multiplexes:  Highway 23 is currently multiplexed for a short distance with Highway 8 across the North Thames River in Mitchell.  Before 1998 Highway 23 was also multiplexed with Highway 86 for 800m in Listowel.  (Highway 86 was decommissioned almost in its entirety in 1998).

Freeway: No

AADT (2001):  Highest: 9,000 from Perth Line 84 to Highway 86 West Junction;

                             Lowest:  3,350 from Highway 7 junction to Highway 83/Perth Line 20.

Road Info:  Pavement conditions along Highway 23 are good for the Highways entire length, though much of the highway is built to late 1980s standard without any sort of partially paved shoulder.

At Highway 8 West Junction in Mitchell:  NB: Turn right across the bridge to downtown Mitchell.  SB: Turn left towards Elginfield and London after the bridge

In Downtown Mitchell (Highway 8 East JCT):  NB: Turn Left at the Traffic Lights.  SB: Turn Right at the lights towards the bridge.

At the Four Corners of Monkton:  NB: Turn left towards Listowel.  SB: Turn Right at the stop sign towards Mitchell.

At Highway 86 (West Junction):  NB: Take the ramp to the right into Downtown Listowel.  SB: Turn left towards Mitchell.

In Downtown Listowel: NB: Turn Left at the traffic lights towards Palmerston.  SB: Turn Right towards Wingham and Mitchel

Highway 23 was downloaded East of Highway 89 in 1998.  Its new names are Perth Road 93 and Wellington Road 123.  Pre-1998 Routing Shown Below. 

In 2004 Highway 23 was rerouted on a former portion of Highway 89 towards Harriston.  Detailed Route Information shown below:

Just West of Palmerston:  NB: Turn Left towards Harriston on Old 89.  SB: Ramp Right on SB 23 towards Listowel.

At Highway 87 (Wellington Road 87) Junction:  NB: Ramp Right towards Harriston.  SB: Turn Left towards Palmerston and Listowel

Highway 23 ENDS